Please provide i686 version of Firefox in x86_64 repositories.
(even if it is not on the install CDs/DVD)
Reasoning: flash still works best with a 32-bit browser. Once you download and install the i686 firefox rpm (all the dependencies of which are already in the x86_64 repos) you can get a very stable browser (run via setarch i386 firefox).
[If you want to be real clean about it, the firefox spec should probably be fixed so it pulls in pkg.${ARCH} instead of pkg for a couple of its requirements]

IMO This bug should be closed as WONTFIX. Flash is non-free software, which fedora does not support. We don't do any special things to support non-free software in such way.
Unless you can find another reason to ship i686 build on firefox in x86_64 fedora, we shouldn't do it.
I'm not closing the bug though because I am not part of FESCO, FPC, QA Team or a firefox packager, and it's not up to me to decide.